Perhaps you should try some spelling variations:
cap nuoc » dat nuoc
dieu tra » dieu tri, kiem tra, dieu cua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
qua cap » qua cac, qua ap, qua ca
tra tre » tran tren, tran tri, tran tro
y nang » ky nang, ly nang, v nang
va dan » va dao, va dau, va dai
va dap » va dao, va dau
ca dan » cac dan, ca dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. hieu qua cap nuoc ((((va dan) or (va dap))) or (ca dan)) dieu tra tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu qua cap nuoc ((((va dan) OR (va dap))) OR (ca dan)) dieu tra tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu qua cap nuoc ((((va dan) or (va dap))) or (ca dan)) dieu tra tre*.